"What do you mean?" Tyris asked.
"We already know how Abominations are usually born. An Awakened one gets too greedy, impatient or both, and ends up losing his body. After that, either they find a way to stabilise their energy form or death ensues.
In this case though, someone has purposely Awakened humans, beasts and monsters against their will and then attempted an experiment as brilliant as much as twisted. Newborn Abominations are made entirely out of energy, with little to no sense of self at all.
By merging them together, our culprit has found a way to stabilise their ethereal forms while at the same time making easier for them to possess a body. Since they are almost mindless hungry beings, they offer no resistance to the merging process.
